From patchwork Thu Dec 12 15:55:31 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Steven Price X-Patchwork-Id: 13905470 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 99611226868; Thu, 12 Dec 2024 15:57:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734019025; cv=none; b=Pmj1b4+4lkA5mhFQb7EJ/5BS+/X0FrQlsXoV6zTx9xRFgUyR+cg3kdWJx3LsaGzkb0ydKPxB25jxYxz6nBymHuH6D0JIyAA0V2LioHXdoQn0mU8ueSumrifplJDKIQr62/vIyfzdue9T1XctDXjW8pjHQxAhxTAuB8sThE0fCB4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734019025; c=relaxed/simple; bh=Sfa2rQiFe5eUpAuVgJdr3VSpylubZjX2o8B/RgRk09Y=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=BoJMaaZSJeyP9NfnXW4i85I+ziLCp4Gjma0zifWfvRoxCQ114KX14VyNY3BI3kpdLQIeS2k/Wvhf1yHms+lfbHIhz1OJ8fapoXvoS8nfBNiYViVofn0PVFhwbVniaK2NBgOazSI/FkzkM1xoFLbeW3GeP6O5pEeyJ3N6PKUPu9A= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 4F26E1762; Thu, 12 Dec 2024 07:57:31 -0800 (PST) Received: from e122027.cambridge.arm.com (e122027.cambridge.arm.com [10.1.39.50]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id CE54F3F720; Thu, 12 Dec 2024 07:56:59 -0800 (PST) From: Steven Price To: kvm@vger.kernel.org, kvmarm@lists.linux.dev Cc: Steven Price , Catalin Marinas , Marc Zyngier , Will Deacon , James Morse , Oliver Upton , Suzuki K Poulose , Zenghui Yu , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Joey Gouly , Alexandru Elisei , Christoffer Dall , Fuad Tabba , linux-coco@lists.linux.dev, Ganapatrao Kulkarni , Gavin Shan , Shanker Donthineni , Alper Gun , "Aneesh Kumar K . V" Subject: [PATCH v6 06/43] arm64: RME: Check for RME support at KVM init Date: Thu, 12 Dec 2024 15:55:31 +0000 Message-ID: <20241212155610.76522-7-steven.price@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20241212155610.76522-1-steven.price@arm.com> References: <20241212155610.76522-1-steven.price@arm.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Query the RMI version number and check if it is a compatible version. A static key is also provided to signal that a supported RMM is available. Functions are provided to query if a VM or VCPU is a realm (or rec) which currently will always return false. Signed-off-by: Steven Price --- Changes since v5: * Reword "unsupported" message from "host supports" to "we want" to clarify that 'we' are the 'host'. Changes since v2: * Drop return value from kvm_init_rme(), it was always 0. * Rely on the RMM return value to identify whether the RSI ABI is compatible. --- arch/arm64/include/asm/kvm_emulate.h | 18 +++++++++ arch/arm64/include/asm/kvm_host.h | 4 ++ arch/arm64/include/asm/kvm_rme.h | 56 ++++++++++++++++++++++++++++ arch/arm64/include/asm/virt.h | 1 + arch/arm64/kvm/Makefile | 3 +- arch/arm64/kvm/arm.c | 6 +++ arch/arm64/kvm/rme.c | 50 +++++++++++++++++++++++++ 7 files changed, 137 insertions(+), 1 deletion(-) create mode 100644 arch/arm64/include/asm/kvm_rme.h create mode 100644 arch/arm64/kvm/rme.c diff --git a/arch/arm64/include/asm/kvm_emulate.h b/arch/arm64/include/asm/kvm_emulate.h index cf811009a33c..4d417e39763e 100644 --- a/arch/arm64/include/asm/kvm_emulate.h +++ b/arch/arm64/include/asm/kvm_emulate.h @@ -702,4 +702,22 @@ static inline void kvm_vcpu_enable_ptrauth(struct kvm_vcpu *vcpu) { vcpu_set_flag(vcpu, GUEST_HAS_PTRAUTH); } + +static inline bool kvm_is_realm(struct kvm *kvm) +{ + if (static_branch_unlikely(&kvm_rme_is_available) && kvm) + return kvm->arch.is_realm; + return false; +} + +static inline enum realm_state kvm_realm_state(struct kvm *kvm) +{ + return READ_ONCE(kvm->arch.realm.state); +} + +static inline bool vcpu_is_rec(struct kvm_vcpu *vcpu) +{ + return false; +} + #endif /* __ARM64_KVM_EMULATE_H__ */ diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index e18e9244d17a..8482638dce3b 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -27,6 +27,7 @@ #include #include #include +#include #include #define __KVM_HAVE_ARCH_INTC_INITIALIZED @@ -380,6 +381,9 @@ struct kvm_arch { * the associated pKVM instance in the hypervisor. */ struct kvm_protected_vm pkvm; + + bool is_realm; + struct realm realm; }; struct kvm_vcpu_fault_info { diff --git a/arch/arm64/include/asm/kvm_rme.h b/arch/arm64/include/asm/kvm_rme.h new file mode 100644 index 000000000000..69af5c3a1e44 --- /dev/null +++ b/arch/arm64/include/asm/kvm_rme.h @@ -0,0 +1,56 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (C) 2023 ARM Ltd. + */ + +#ifndef __ASM_KVM_RME_H +#define __ASM_KVM_RME_H + +/** + * enum realm_state - State of a Realm + */ +enum realm_state { + /** + * @REALM_STATE_NONE: + * Realm has not yet been created. rmi_realm_create() may be + * called to create the realm. + */ + REALM_STATE_NONE, + /** + * @REALM_STATE_NEW: + * Realm is under construction, not eligible for execution. Pages + * may be populated with rmi_data_create(). + */ + REALM_STATE_NEW, + /** + * @REALM_STATE_ACTIVE: + * Realm has been created and is eligible for execution with + * rmi_rec_enter(). Pages may no longer be populated with + * rmi_data_create(). + */ + REALM_STATE_ACTIVE, + /** + * @REALM_STATE_DYING: + * Realm is in the process of being destroyed or has already been + * destroyed. + */ + REALM_STATE_DYING, + /** + * @REALM_STATE_DEAD: + * Realm has been destroyed. + */ + REALM_STATE_DEAD +}; + +/** + * struct realm - Additional per VM data for a Realm + * + * @state: The lifetime state machine for the realm + */ +struct realm { + enum realm_state state; +}; + +void kvm_init_rme(void); + +#endif diff --git a/arch/arm64/include/asm/virt.h b/arch/arm64/include/asm/virt.h index ebf4a9f943ed..e45d47156dcf 100644 --- a/arch/arm64/include/asm/virt.h +++ b/arch/arm64/include/asm/virt.h @@ -81,6 +81,7 @@ void __hyp_reset_vectors(void); bool is_kvm_arm_initialised(void); DECLARE_STATIC_KEY_FALSE(kvm_protected_mode_initialized); +DECLARE_STATIC_KEY_FALSE(kvm_rme_is_available); static inline bool is_pkvm_initialized(void) { diff --git a/arch/arm64/kvm/Makefile b/arch/arm64/kvm/Makefile index 3cf7adb2b503..ce8a10d3161d 100644 --- a/arch/arm64/kvm/Makefile +++ b/arch/arm64/kvm/Makefile @@ -23,7 +23,8 @@ kvm-y += arm.o mmu.o mmio.o psci.o hypercalls.o pvtime.o \ vgic/vgic-v3.o vgic/vgic-v4.o \ vgic/vgic-mmio.o vgic/vgic-mmio-v2.o \ vgic/vgic-mmio-v3.o vgic/vgic-kvm-device.o \ - vgic/vgic-its.o vgic/vgic-debug.o + vgic/vgic-its.o vgic/vgic-debug.o \ + rme.o kvm-$(CONFIG_HW_PERF_EVENTS) += pmu-emul.o pmu.o kvm-$(CONFIG_ARM64_PTR_AUTH) += pauth.o diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index a102c3aebdbc..93087eca9c51 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -40,6 +40,7 @@ #include #include #include +#include #include #include @@ -59,6 +60,8 @@ enum kvm_wfx_trap_policy { static enum kvm_wfx_trap_policy kvm_wfi_trap_policy __read_mostly = KVM_WFX_NOTRAP_SINGLE_TASK; static enum kvm_wfx_trap_policy kvm_wfe_trap_policy __read_mostly = KVM_WFX_NOTRAP_SINGLE_TASK; +DEFINE_STATIC_KEY_FALSE(kvm_rme_is_available); + DECLARE_KVM_HYP_PER_CPU(unsigned long, kvm_hyp_vector); DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page); @@ -2769,6 +2772,9 @@ static __init int kvm_arm_init(void) in_hyp_mode = is_kernel_in_hyp_mode(); + if (in_hyp_mode) + kvm_init_rme(); + if (cpus_have_final_cap(ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE) || cpus_have_final_cap(ARM64_WORKAROUND_1508412)) kvm_info("Guests without required CPU erratum workarounds can deadlock system!\n" \ diff --git a/arch/arm64/kvm/rme.c b/arch/arm64/kvm/rme.c new file mode 100644 index 000000000000..b88269b80c11 --- /dev/null +++ b/arch/arm64/kvm/rme.c @@ -0,0 +1,50 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2023 ARM Ltd. + */ + +#include + +#include +#include + +static int rmi_check_version(void) +{ + struct arm_smccc_res res; + int version_major, version_minor; + unsigned long host_version = RMI_ABI_VERSION(RMI_ABI_MAJOR_VERSION, + RMI_ABI_MINOR_VERSION); + + arm_smccc_1_1_invoke(SMC_RMI_VERSION, host_version, &res); + + if (res.a0 == SMCCC_RET_NOT_SUPPORTED) + return -ENXIO; + + version_major = RMI_ABI_VERSION_GET_MAJOR(res.a1); + version_minor = RMI_ABI_VERSION_GET_MINOR(res.a1); + + if (res.a0 != RMI_SUCCESS) { + kvm_err("Unsupported RMI ABI (v%d.%d) we want v%d.%d\n", + version_major, version_minor, + RMI_ABI_MAJOR_VERSION, + RMI_ABI_MINOR_VERSION); + return -ENXIO; + } + + kvm_info("RMI ABI version %d.%d\n", version_major, version_minor); + + return 0; +} + +void kvm_init_rme(void) +{ + if (PAGE_SIZE != SZ_4K) + /* Only 4k page size on the host is supported */ + return; + + if (rmi_check_version()) + /* Continue without realm support */ + return; + + /* Future patch will enable static branch kvm_rme_is_available */ +}